JP4882401B2 - In-vehicle gateway device and data transmission order determination method for in-vehicle gateway device - Google Patents

Description

  The present invention relates to an in-vehicle gateway device that relays data between a plurality of networks in a vehicle.

  Conventionally, an in-vehicle gateway device that relays data between networks has been used in order to realize data transfer between in-vehicle devices connected to different networks in the vehicle. In this in-vehicle gateway device, a device that receives data with an ID code indicating a transmission destination from one network and transmits it to another network according to the priority order of ID codes stored in advance is known ( Patent Document 1).

JP 2005-159568 A

  The in-vehicle gateway device disclosed in Patent Document 1 preferentially transmits data of an ID code having a high priority, and postpones data of an ID code having a low priority. For this reason, if a large number of data waiting for transmission is accumulated in the in-vehicle gateway device due to the occurrence of a retry due to a transmission error or insufficient line capacity of the destination network, ID code data with a low priority can be transmitted forever. Can not.

The present invention is applied to an in-vehicle gateway device that relays data exchanged between a plurality of networks each having at least one or more terminal devices. The in-vehicle gateway device according to the present invention receives data to which transmission destination identification information is attached, temporarily stores the received data as transmission waiting data, and transmits the data to another network in a predetermined transmission order. At this time, the identification information attached to the received data is compared with the identification information attached to the transmission-waiting data temporarily stored in the past, and it is determined whether or not both pieces of the identification information match. Are determined to match, the transmission-waiting data with the matching identification information is preferentially transmitted.

  According to the present invention, data received from one network can be transmitted to another network in an appropriate order.

-First embodiment-
A configuration of an in-vehicle network using an embodiment of an in-vehicle gateway device according to the present invention is shown in FIG. In this in-vehicle network, a communication network A to which a node A1 and a node A2 are connected and a communication network B to which a node B1 and a node B2 are connected are connected via a gateway device 1. The gateway device 1 is a device for relaying and transferring data between the communication network A and the communication network B, and has various gateway functions such as communication protocol conversion and packet filtering. By using the gateway device 1, the communication network A and the communication network B can communicate with each other between the nodes.

  The communication network A corresponds to, for example, a body LAN that handles information on various states of the vehicle. At this time, the node A1 and the node A2 respectively transmit and receive data regarding the door lock state, the open / close state of the power window, the lighting state of the room lamp, and the like via the network A. The network B corresponds to an information LAN that handles information on various information devices provided in the vehicle, for example. At this time, the node B1 and the node B2 correspond to, for example, an audio ECU and a navigation ECU. Various types of data related to audio, navigation devices, and the like are transmitted / received via the network B. Since these are examples of communication networks, other contents may be used.

  The configuration of the gateway device 1 is shown in FIG. The gateway device 1 includes a reception processing unit 4, a transmission waiting data temporary storage unit 5, a transmission processing unit 6, and a transmission priority order determination unit 7. The transmission priority order determination unit 7 includes a priority order recording unit 8 and a highest priority transmission data determination unit 9.

  The reception processing unit 4 is connected to the communication network A and performs a reception process of data output to the communication network A. This received data is output from the node A1 or node A2 of FIG. 1 to the communication network A, and an ID code, which is identification information for indicating a transmission destination, is attached at the time of output. The reception processing unit 4 determines the transmission destination from the ID code attached to the reception data. When the transmission destination is the node B1 or the node B2 connected to the communication network B, the reception data and the ID code are The data is output to the transmission waiting data temporary storage unit 5 via the highest priority transmission data determination unit 9.

  The transmission-waiting data temporary storage unit 5 temporarily stores received data output from the reception processing unit 4 via the highest priority transmission data determination unit 9 together with an ID code as transmission-waiting data, thereby performing buffer memory processing. Do. The data and ID code temporarily stored by the transmission waiting data temporary storage unit 5 are output from the transmission waiting data temporary storage unit 5 to the transmission processing unit 6 in response to an output request from the transmission processing unit 6. At this time, the order of data to be output and the ID code is determined by a method described later.

  The highest-priority transmission data determination unit 9 outputs the reception data and ID code output from the reception processing unit 4 to the transmission-waiting data temporary storage unit 5 for temporary storage. Furthermore, the ID code of the received data is compared with the ID code already temporarily stored in the transmission waiting data temporary storage unit 5, that is, the ID code of the transmission waiting data temporarily stored in the past, and based on the comparison result Then, it is determined whether or not there is a matching ID code. As a result, if there is an ID code temporarily stored in the past that matches the ID code of the received data, the highest priority transmission to which transmission waiting data with the ID code should be transmitted preferentially Set to data.

  The priority order recording unit 8 records the priority order of ID codes set in advance. As a result of the comparison of the ID codes as described above in the highest priority transmission data determination unit 9, if no ID code temporarily stored in the past matches the ID code of the received data, this priority order Based on the above, the transmission order of the transmission waiting data recorded in the transmission waiting data temporary storage unit 5 is determined. As described above, if there is an ID code temporarily stored in the past that matches the ID code of the received data, the ID code is used regardless of the priority order recorded in the priority order recording unit 8. The earliest transmission order is set as data with the highest priority for data marked with.

  The transmission processing unit 6 is connected to the communication network B and performs data transmission processing to the communication network B. The transmission processing unit 6 monitors the state of the communication network B and makes an output request for transmission data when the transmission is possible. In response to this request, transmission data and an ID code are output from the transmission waiting data temporary storage unit 5 to the transmission processing unit 6 in accordance with the data transmission order determined as described above. The transmission data and the ID code are transmitted to the communication network B. Transmission data from the transmission processing unit 6 is received at the node B1 or the node B2 designated as the transmission destination. At this time, the transmission destination is determined based on the ID code attached to the transmission data. As described above, data transfer from the communication network A to the communication network B is performed.

  In the above description, the case where data is transferred from the communication network A to the communication network B has been described. However, data may be transferred from the communication network B to the communication network A in the same manner. In that case, the communication network B and the reception processing unit 4 are connected, and the communication network A and the transmission processing unit 6 are connected. Alternatively, data may be transferred from the communication network B to the communication network A by providing another set of gateway devices 1 in which each configuration of the gateway device 1 is inverted for transmission and reception.

  FIG. 3 shows a flowchart of the highest priority transmission data determination process executed when data is transferred from the communication network A to the communication network B as described above. In step S <b> 10, the data output to the communication network A is received by the reception processing unit 4. This received data is attached with the ID code of the transmission destination. The reception data and the ID code are output from the reception processing unit 4 to the highest priority transmission data determination unit 9.

  In step S20, the highest-priority transmission data determination unit 9 compares the ID code attached to the reception data received in step S10 with the ID code temporarily stored in the transmission-waiting data temporary storage unit 5 in the past. It is determined whether or not data having the same ID as the data ID exists in the transmission waiting data temporarily stored in the transmission waiting data temporary storage unit 5. If data with the same ID exists, that is, if there is an ID code stored in the transmission-waiting data temporary storage unit 5 that matches the ID code of the received data, the process proceeds to step S30.

  In step S30, the transmission waiting data determined to have the same ID as the received data in step S20, that is, the data with the ID code that matches the ID code of the received data is set as the highest priority transmission data. The first transmission order is set for the highest priority transmission data set here. If step S30 is performed, it will progress to step S40. In this case, when a transmission data output request is made from the transmission processing unit 6, the highest priority transmission data is output from the transmission waiting data temporary storage unit 5 to the transmission processing unit 6 together with the corresponding ID code. As a result, the transmission processing unit 6 preferentially transmits the highest priority transmission data to the communication network B.

  On the other hand, if it is determined in step S20 that there is no data with the same ID, that is, if there is no ID code stored in the transmission-waiting data temporary storage unit 5 that matches the ID code of the received data. Advances to step S40 without executing step S30. In this case, when a transmission data output request is made from the transmission processing unit 6, any transmission is performed according to the transmission order determined based on the priority order of the ID codes recorded in the priority order recording unit 8 accordingly. The waiting data is output together with the ID code from the transmission waiting data temporary storage unit 5 to the transmission processing unit 6 and transmitted to the communication network B.

  In step S40, the reception data received in step S10 is temporarily stored in the transmission waiting data temporary storage unit 5 as transmission waiting data together with the ID code. If step S40 is performed, the flowchart of FIG. 3 will be complete | finished.

According to 1st Embodiment described above, there exists the following effect.
(1) Data received from the communication network A received by the reception processing unit 4 is temporarily stored by the transmission waiting data temporary storage unit 5 as transmission waiting data, and the temporarily stored transmission waiting data is transmitted by the transmission processing unit 6. Transmit to network B in a predetermined transmission order. At this time, the highest-priority transmission data determination unit 9 compares the ID code attached to the received data with the ID code attached to the transmission-waiting data temporarily stored in the past (step S20). Based on this, the transmission order of the transmission waiting data is determined (step S30). Since it did in this way, the data received from one network can be transmitted to another network in an appropriate order.

(2) In step S20, the ID code attached to the received data is compared with the ID code attached to the transmission waiting data temporarily stored by the transmission waiting data temporary storage unit 5 in the past, and both ID codes are found. It is determined whether or not they match. If it is determined that the two ID codes match, in step S30, the transmission processing unit 6 is preferentially transmitted by setting the transmission waiting data with the matching ID code as the highest priority transmission data. Since the transmission order of the transmission waiting data is determined in this way, the transmission order can be determined according to the communication state between the networks regardless of the priority order recorded in advance.

-Second Embodiment-
A second embodiment of the in-vehicle gateway device according to the present invention will be described. FIG. 4 shows the configuration of the gateway device 1 in the present embodiment. This gateway apparatus is the same as that of the first embodiment shown in FIG. 2 except that the gateway apparatus includes an unnecessary data deleting unit 10 for deleting the received data when the received data is unnecessary. The same.

  The unnecessary data deletion unit 10 is provided in a part of the transmission priority order determination unit 7 in the gateway device 1, and when data having the same ID as the ID of the reception data exists in the transmission waiting data, the contents of these data To determine whether the received data is unnecessary. As a result, if both data contents match, it is determined that the received data is unnecessary, and the received data is deleted. This prevents duplicate data from being temporarily stored in the transmission-waiting data temporary storage unit 5 to prevent the buffer memory from overflowing, and prevents unnecessary data transfer, thereby reducing the network line load.

  FIG. 5 shows a flowchart of the highest priority transmission data determination process executed when data is transferred from the communication network A to the communication network B in this embodiment. In this flowchart, the same step numbers are used for processing steps having the same contents as those in the flowchart in the first embodiment shown in FIG. In the following description, the description of the same step number as that in the first embodiment is omitted unless particularly necessary.

  After the processes of step S10 and step S20 are executed as described above, the unnecessary data deletion unit 10 performs the unnecessary data deletion process of steps S21 and S22. In step S21, with respect to the transmission waiting data determined to have the same ID as the reception data in step S20, the contents of the transmission waiting data and the reception data are compared to determine whether the contents are different. If the contents of the received data and the data waiting for transmission are different, it is determined that the received data is necessary, and the process proceeds to step S30. On the other hand, if the contents of the received data and the data waiting for transmission match, it is determined that the received data is unnecessary, and the process proceeds to step SS22. At this time, it is possible to determine whether or not the data contents match by performing a parity check, CRC (Cyclic Redundancy Check), or the like instead of comparing the entire data contents of the received data and the transmission waiting data. .

  In step S22, the received data received in step S10 is deleted together with the ID code. In this case, the received data is not temporarily stored in the transmission waiting data temporary storage unit 5 as transmission waiting data. If step S22 is performed, it will progress to step S30.

  In steps S30 and S40, the above-described processing is executed to set the highest priority transmission data and temporarily store the transmission waiting data. If step S40 is performed, the flowchart of FIG. 5 will be complete | finished.

According to 2nd Embodiment described above, there exists the following effect.
(1) If it is determined in step S20 that the ID code attached to the received data matches the ID code attached to the transmission-waiting data temporarily stored in the past, the unnecessary data deleting unit 10 further receives the received data. The content of the data is compared with the content of the transmission waiting data with the matching ID code (step S21), and the transmission order of the transmission waiting data is determined based on the comparison result (step S30). . Since it did in this way, the data received from one network can be transmitted to another network in a more appropriate order than in the first embodiment.

(2) In step S21, the content of the received data is compared with the transmission-waiting data with the ID code that matches the received data, and it is determined whether or not the data content matches. If it is determined that the data contents do not match, in step S30, the transmission processing unit 6 is preferentially transmitted by setting the transmission waiting data as the highest priority transmission data. Since the transmission order of the transmission waiting data is determined in this way, the transmission order is determined according to the communication state between the networks regardless of the priority order recorded in advance, as in the first embodiment. can do.

(3) If it is determined in step S21 that the contents of both data match, the received data is deleted (step S22), so that duplicate data is not temporarily stored in the transmission-waiting data temporary storage unit 5 so that the buffer memory Network overflow, and unnecessary data transfer can be prevented to reduce the network line load.

-Third embodiment-
A third embodiment of the in-vehicle gateway device according to the present invention will be described. In the present embodiment, a method for determining the transmission priority of data when a plurality of highest priority transmission data described in the first or second embodiment is set at the same time will be described. Note that the configuration of the gateway device 1 in the present embodiment is the same as that shown in FIG. 2 or FIG.

  FIG. 6 shows a flowchart of the priority determination process for the highest priority transmission data executed by the highest priority transmission data determination unit 9 when determining the transmission priority of the highest priority transmission data set at the same time in the present embodiment. If the highest priority transmission data is set in step S110 by setting the highest priority transmission data in step S30 of FIG. 3 or FIG. 5, the process of step S120 is executed next.

  In step S120, it is determined whether or not there is already set highest priority transmission data waiting for transmission. If other highest-priority transmission data is already set and waiting for transmission before the highest-priority transmission data is generated in step S110, the process proceeds to step S130. In step S130, the transmission priority of the highest priority transmission data generated in step S110 is set to the lowest among a plurality of highest priority transmission data. By doing in this way, when a plurality of highest priority transmission data is in a transmission waiting state, the highest priority transmission data set in the past can be transmitted first. If step S130 is performed, the flowchart of FIG. 6 will be complete | finished.

  On the other hand, if it is determined in step S120 that there is no highest priority transmission data waiting for transmission, the process proceeds to step S140. In step S140, the transmission priority of the highest priority transmission data generated in step S110 is set to the first. If step S140 is performed, the flowchart of FIG. 6 will be complete | finished.

  According to the third embodiment described above, even when a plurality of highest priority transmission data are set simultaneously, a plurality of highest priority transmission data are transmitted by transmitting the highest priority transmission data set in the past first. The priority transmission data can be transmitted in an appropriate order.

  In each of the above embodiments, the example in which the communication network is configured by two nodes has been described. However, the present invention is not limited to this content, and the communication network may be configured by an arbitrary number of nodes. it can.

  Moreover, although each said embodiment demonstrated the example of the vehicle-mounted network in which two communication networks are connected via the gateway apparatus, this invention is not limited to this content. The present invention can be similarly applied to any gateway device that is used in an in-vehicle network and connects two or more communication networks to perform data relay and data transfer between the communication networks.

  In each of the embodiments described above, the reception means is the reception processing section 4, the storage means is the transmission waiting data temporary storage section 5, the transmission means is the transmission processing section 6, the transmission order determination means is the highest priority transmission data determination section 9, and the data The deletion means is realized by the unnecessary data deletion unit 9. However, the above description is merely an example, and when interpreting the invention, there is no limitation or restriction on the correspondence between the items described in the above embodiment and the items described in the claims.

  Each embodiment and various modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired.

It is a figure which shows the structure of a vehicle-mounted network. It is a figure which shows the structure of the gateway apparatus by 1st Embodiment. It is a flowchart of the highest priority transmission data determination process performed in 1st Embodiment. It is a figure which shows the structure of the gateway apparatus by 2nd Embodiment. It is a flowchart of the highest priority transmission data determination process performed in 2nd Embodiment. It is a flowchart of the priority determination process of the highest priority transmission data performed in 3rd Embodiment.

Explanation of symbols

1: Gateway device 4: Reception processing unit 5: Temporary transmission data storage unit 6: Transmission processing unit 7: Transmission priority determination unit 8: Priority recording unit 9: Top priority transmission data determination unit 10: Unnecessary data deletion unit

Claims (4)

An in-vehicle gateway device that relays data exchanged between a plurality of networks each having at least one or more terminal devices,
Receiving means for receiving, as received data, data output from the terminal device to any of the plurality of networks and having identification information of a transmission destination attached thereto;
Storage means for temporarily storing received data received by the receiving means as transmission-waiting data;
Transmission means for transmitting the transmission waiting data temporarily stored by the storage means to another network in a predetermined transmission order;
The identification information attached to the received data is compared with the identification information attached to the transmission-waiting data temporarily stored by the storage means in the past, and it is determined whether or not both identification information matches, An in-vehicle gateway device comprising: a transmission order determining unit that preferentially transmits the transmission waiting data with the matching identification information to the transmission unit when it is determined that the identification information matches . The in-vehicle gateway device according to claim 1,
When it is determined that the two identification information matches, the transmission order determining means further compares the content of the received data with the content of the transmission waiting data to which the matching identification information is attached. Determine whether they match,
An in-vehicle gateway device characterized in that when it is determined that the contents of both data do not match, the transmission waiting data is preferentially transmitted to the transmission means. The in-vehicle gateway device according to claim 2,
Further comprising data deletion means for deleting the received data before temporarily storing by the storage means;
The in-vehicle gateway device characterized in that the transmission order determining means deletes the received data by the data deleting means when it is determined that the contents of both data match. In a vehicle-mounted gateway device that relays data exchanged between a plurality of networks each having at least one or more terminal devices, a transmission order determination method for transmitting data from any network to another network. And
The data output to any one of the plurality of networks from the terminal device, the data with the identification information of the destination is received as received data,
Temporarily store the received data as transmission-waiting data;
The identification information attached to the received data is compared with the identification information attached to the transmission-waiting data temporarily stored in the past, and it is determined whether or not both identification information matches. If it is determined, the data transmission order determination method for the in-vehicle gateway device, wherein the transmission waiting data with the matching identification information is preferentially transmitted.

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